Yichun GB 45 # round steel Tiancheng manufacturers / imports GB 45 # round steel Shandong Liaocheng the Tiancheng tube Co., Ltd. specializing in the production of ductile iron pipe, small diameter seamless steel pipe, seamless steel pipe of large diameter stainless steel pipe, hot dip galvanized steel pipe, all kinds of steel, can be customized for the user a variety of special specifications, special material seamless steel pipe, timely delivery, quality and cheap, welcome to order 15,063,536,111 15,069,589,959 Ge printed Wu www.sdtcgy.com 

 45 # round steel section of a round solid bar of steel. Mm of diameter, its specifications, such as "50" means that the diameter of 50 mm round bar. 
 45 # round steel into hot rolling, forging and cold drawing three. Hot rolled round steel specifications of 5.5-250 mm. :5.5-25 mm round bar is mostly straight into bundles of supplies, commonly used to make steel bars, bolts and various mechanical parts; greater than 25 mm round steel, mainly used in the manufacture of mechanical parts or seamless steel pipe billet. 

 Chemical composition: 
 Carbon, the C: 0.42 to 0.50 Si Si: 0.17 ~ 0.37 Mn Mn: 0.50 ~ 0.80 SS: ≤ 0.035 phosphorus P: ≤ 0.035 Chromium Cr: ≤ 0.25 Nickel Ni: ≤ 0.25 Copper Cu: ≤ 0.25 
 Mechanical properties: 
 Tensile strength σb (MPa): ≥ 600 (61) yield strength σs (MPa): ≥ 355 (36) elongation δ5 (%): ≥ 16 Reduction of area ψ (%): ≥ 40 impact energy Akv (J ): ≥ 39 impact the toughness the value αkv (J/cm2): ≥ 49 (5) Hardness: heat treatment, ≤ 229HB; annealing steel, ≤ 197HB sample size: sample size is 25mm 
 The Yichun GB 45 # round steel the heaven manufacturers / imports GB 45 # round steel